US PATENT SUBCLASS 372 / 59
.~.~ Gas maintenance (e.g., purification, replenishment, etc.)

Current as of: June, 1999
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372 /   HD   COHERENT LIGHT GENERATORS

39  DF  PARTICULAR ACTIVE MEDIA {7}
55  DF  .~ Gas {6}
59.~.~ Gas maintenance (e.g., purification, replenishment, etc.)

DEFINITION

Classification: 372/59

Gas maintenance (e.g., purification, replenishment, etc.):

(under subclass 55) Subject matter including means for maintaining the operational level of the active medium.